more stats
1,270 ft
Distance
3 ft
Climb
-3 ft
Descent
00:04:58
Avg time
-1 ft
Altitude change
3,718 ft
Altitude min
3,722 ft
Altitude max
3,719 ft
Altitude start
3,717 ft
Altitude end
-0.1%
Grade
-3.3%
Grade max
2.3%
Grade min
315 ft
Distance climb
285 ft
Distance down
673 ft
Distance flat
00:04:58
Avg time

Fire Flies Details

  • Activities
    • Mountain Bike
    • Hike
    • Trail Running
  • Riding Area
    Dark Forest and Ancient Oaks
    Spearfish, South Dakota
  • Difficulty Rating
    Green Rate
  • Local Popularity
    65 in Mountain Biking heatmap [+]
    • 60 in Trail Running
    • 5 in Hiking
  • Global Ranking
    #225252 in Mountain Biking [+]
    • #439589 in Trail Running
    • #443996 in Hiking
  • State Ranking
    #358 in Mountain Biking · South Dakota [+]
    • #694 in Trail Running
    • #696 in Hiking
  • Trail Type
    Singletrack
  • Bike Type
    AM, XC
  • Direction
    Uphill Primary[+]
    • Uphill Primary for Trail Running
    • Uphill Primary for Hiking
  • Climb Difficulty
    Blue
  • Physical Rating
    Moderate
  • Trail Visibility
    Always easy to follow
  • Dogs Allowed
    Yes
  • Lighting
    No
  • Year Opened
    2026
  • Land Owner
    City of Spearfish

Fireflies is the gateway to the rest of the Dark Forest Trail System. From here, you can lap Peanut Thief or Mad Hornets, or continue on to Stump Duck.

This directional trail begins at the Spearfish Recreation Path and features a steady climb followed by a fun, flowing descent to the start of Stump Duck. As part of the Dark Forest Trail System, Fireflies provides convenient access to purpose-built singletrack just minutes from downtown Spearfish and the Spearfish City Campground.

Access Info

Access off the Spearfish Rec Path in the City Campground.

Tags
Flowy

Local Trail Association

Recent Activity on Trail

Past Week
  • 0 rides
  •  
6 Months
  • 30 rides
  • 8 miles avg distance
All
  • 30 rides
  • Last: Oct 26, 2026
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Status:
on Oct 2, 2026
Ideal
no votes yet
Your vote: 0

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      Directions to fire-flies trailhead (44.477880, -103.855250)
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      Nearby Trails

      Dark Forest and Ancient Oaks

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      Frequently Asked Questions

      ▼ Where is Fire Flies located?
      Fire Flies is located in Dark Forest and Ancient Oaks, Spearfish, South Dakota, United States. It is part of the Dark Forest and Ancient Oaks trail network. The trailhead is located at coordinates 44.47788, -103.85525.
      ▼ How hard is Fire Flies?
      Fire Flies is rated as Green difficulty. The physical rating is Moderate. The average grade is 0.1%. The climb difficulty is rated Blue.
      ▼ What is the elevation gain for Fire Flies?
      Fire Flies has 3 ft of elevation gain. The trail has 3 ft of elevation descent. The elevation ranges from 3,718 ft to 3,722 ft.
      ▼ Is Fire Flies a point to point trail?
      Fire Flies is not a point to point trail. The direction is Uphill Primary. The trail type is singletrack.
      ▼ How long is Fire Flies?
      Fire Flies is 1,270 ft long. The trail type is singletrack.
      ▼ Are dogs allowed on Fire Flies?
      Yes, dogs are allowed on Fire Flies. Please keep dogs on a leash where required and clean up after them.
      ▼ When is the best time of year to ride Fire Flies?
      Based on activity log data, the most popular months to ride Fire Flies are:
      • August (13 activities)
      • September (7 activities)
      • July (5 activities)
      Check the reports page for current trail conditions.
      ▼ How do I access Fire Flies? Where is the closest parking trailhead?
      The closest parking and trailhead locations to Fire Flies are: View all parking locations in the area.
      ▼ How long does it take to ride Fire Flies?
      Based on recorded activities, it takes an average of 5 minutes to ride Fire Flies. The trail is 1,270 ft long. Actual times will vary based on fitness level, conditions, and pace. View recent activity logs for more details.
      ▼ How busy is Fire Flies?
      Fire Flies is a moderately popular trail. There have been 111 recorded activities on this trail. The trail has received 129 check-ins. View recent activity on this trail.

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